Screw-driver mechanism for insulator screws



Patented Mar. 1, 1927.

UNITED STATES ALBERT T. SCHEIWER, OF ERIE, PENNSYLVANIA.

SCREW-DRIVER MECHANISM FOR INSULATOR SCREWS Application led October 25,1924.

This invention is designed to facilitate the driving of insulatorscrews. Vith the present device the screw may be driven from a rigidconnection between the screw and operating handle or through a ratchetmechanism which permits the driving in either direction. The forming ofa ratchet mechanism in a practical manner in a device of this characterforms the principal subject matter of the invention.

The invention is illustrated'in the accompanying drawings as followsFig. 1 shows a plan view of the device.

Fig. 2 a Side elevation of the same partly in section.

Fig. 3 a section on the line 3-3 in Figs. 1 and 2.

Fig. 4 a section on the line 4-4 in Fig, 3.

Figs. 5 and 6 similar sections with a different setting of the ratchetdevice.

Fig. 7 a detail view of the ratchet dog.

Fig. 8 a front elevation of the ratchet dog spring.

Fig. 9 a side elevation of the same spring.

Fig. v10 a bottom view of the ratchet dog id holding cap.

Fig. 11 is a section on the line 11-11 in Fig. 1.

1 marks the insulator, 2 a screw in the insulator, 3 a frame in whichthe screw driver is placed, 4 securing jaws adapted to engage theinsulator, 5 a screw driver end adapted to engage the slot of the screw2v-` and 6 a screw stem extending from the screw driver point 5, saidscrew being slidingly mounted in an opening 7 in the frame 3. The screwis engaged by a knurled nut 8 which extends through a slot 9 in theframe, By turning the nut 8 the screw may be screwed down into the slot5 and exert pressure on the insulator so as to clamp the whole devicetogether in the jaws 4. A handle 10 is journaled on an extension 11 ofthe frame 3 and secured thereon by screws 12 which extend into grooves13 in the frame. The handle 10 has an opening 14 in alinement with theopening 7 and the upper end of the screw stem extends into this openingand is provided with square faced ratchet teeth 15. The upper end of thehandle has a socket 16 surrounding the opening 14 and the trunnion ends17 of the ratchet pawls 17a. rest on the bottom of the socket 16 beinglocated as chords to the arc of the circle of the socket. There are twoof these pawls oppositely placed as clearly serial No. 745,781.

and the other rearwardly from the plate,

one finger engaging the wall of the opening 14 and the other engagingapawl 17 a. Thus the pawl is yieldingly forced into engagement with theratchet teeth 15. A cap 22 is arranged in the socket- 16 and this caphas the slots 23 in which the upper ends of the Vpawls and spring platesare held. The cap is secured in the socket by means of pins 24. In orderto disengage either pawl a cam ring 25 is journaled'on the screw stem inan opening in the handle 10. The cam ring has a pin 26 which extendsthrough a slot 27 in the handle so that the ring may be swung manuallyto release either ratchet pawl desired. The ring is provided with a cam28 integral with and projecting upwardly from the ring and this cam isshaped to engage the lower ends of the pawls 172L when the cam ring isswung in either one or the other direction, in one direction releasingone pawl and permitting the opposite pawl to operate so as to screw upthe screw, or when swung to the opposite direction effecting theengagement of the pawl for unscrewing a screw. Where the cam is in thecentral position as shown in Fig. 5 both pawls engage the ratchet andthe handle will be locked with the screw driver preventing its turningin either direction.

In operation the insulator with its screw is placed in the jaws, thescrew driver moved down to engagement with the slot of the screw and ifit is desired to have the handle work on the ratchet the pin 26 is swungto the sides disengaging the ratchet` locking the screw for a left-handturn. If it is desired to remove the screw the device is put in positionin the manner above described and the opposite ratchet released, thussetting the ratchet mechanism to unscrew the screw, or if desired, bothratchet pawls may be in locking position by bringing the cam ring to thecentral position.

What I claim as new is 1. In a screw driver mechanism for insulatorscrews the combination of a driver; a frame in which the driver-ismounted comprising hooks adapted to engage an insulator; a screw threadformed on the driver;

These plates have the spring lingers means for feeding the driver bymeans of the screw thread relativel)1 to the frame; a handle; and aratchet driving connection hetween the handle and driver.

2. In a screw driver mechanism for insulator' screws, the combination ofa driver; a frame in which the driver is mounted coniprising hooksadapted to engage an insulator; a screw thread formed on the driver;means for feeding' the driver hy means of the screw thread relativel)7to the frame; a handle; and a ratchetdrivingr connection between thehandle and driver comprising means for reversing` the ratchet action.

3. In a screw driver mechanism for insulator screws, the combination ofa driver; a frame in which the driver is mounted Co1nprising hooksadapted to engage an insulator; a screw thread formed on the driver;means for feeding the driver by means of the screw thread relativel;7 tothe frame;

a handle; and a ratchet driving connection between the handle and drivercomprising means for locking` the handle with the driver and forreleasing the handle from the driver in one direction.

4.-. ln a screw driver mechanism for insulator screws, the combinationof a driver; a frame in Which the driver is mounted coniprising` hooksadapted to engage an insulator; a screw thread forme-d on the driver;means for feeding;` the driver by means of the scre. thread relativelyto the frame; a handle; and a ratchet driving connection between thehandle and driver coinprisinfb)` means for locking` the handle with thedriver and for releasing` the handle from the driver in eitherdirection.

ln testimomv whereof I have hereunto set my hand.

ALBERT T. SCHEHVER.

